# C1.Document.C1SortedList-2.Add

## Content

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<h1 id="C1_Document_C1SortedList_2_Add_" data-uid="C1.Document.C1SortedList`2.Add*">Add Method
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<div class="markdown level0 conceptual"></div>



<a id="C1_Document_C1SortedList_2_Add_" data-uid="C1.Document.C1SortedList`2.Add*"></a>
<h4 id="C1_Document_C1SortedList_2_Add__0__1_" data-uid="C1.Document.C1SortedList`2.Add(`0,`1)">Add(TKey, TValue)</h4>
<div class="markdown level1 summary"><p>Adds value to the list, returns index of the added value, throws exception if value with specified key already exists.</p>
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<div class="markdown level1 conceptual"></div>
<h5 class="declaration">Declaration</h5>
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  <pre><code class="lang-csharp hljs">public int Add(TKey key, TValue value)</code></pre>
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  <pre><code class="lang-vbnet hljs">Public Function Add(key As TKey, value As TValue) As Integer</code></pre>
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<h5 class="parameters">Parameters</h5>
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  <thead>
    <tr>
      <th>Type</th>
      <th>Name</th>
      <th>Description</th>
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  <tbody>
    <tr>
      <td><span class="xref">TKey</span></td>
      <td><span class="parametername">key</span></td>
      <td></td>
    </tr>
    <tr>
      <td><span class="xref">TValue</span></td>
      <td><span class="parametername">value</span></td>
      <td></td>
    </tr>
  </tbody>
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<h5 class="returns">Returns</h5>
<table class="table table-bordered table-condensed">
  <thead>
    <tr>
      <th>Type</th>
      <th>Description</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.int32">int</a></td>
      <td></td>
    </tr>
  </tbody>
</table>
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